It also unified the Central Plains. Why did Cao kill barbarians, but Hou Jin was proud of cutting land?

There are two reasons: first, the enemy facing Hou Jin is stronger; Second, the post-Jin national strength is not as good as that of Cao Wei. Therefore, in the face of foreign enemies, Hou Jin had to cede territory and became a big joke at that time.

First of all, the barbarians faced by the late Jin Dynasty are the Khitans, who are very powerful. The strength of the Khitans can compete with the Central Plains, which is not comparable to that of the barbarians before. Although the late Jin unified the Central Plains, the imperial court was divided internally, and everyone had their own ulterior motives. Liu Zhiyuan can always replace Houjin and make it disappear. Moreover, there are other separatist forces in the local area, and the post-Jin national strength is really not good.

It is also due to the contribution of Qidan that the late Jin Dynasty was able to unify the Central Plains. Therefore, at that time, many officials of the late Jin Dynasty who were related to the Khitan were friendly to the Khitan and had no impulse to crusade against the Khitan. This is also one of the reasons for the late Jin dynasty to cede land. At that time, Khitan was not a wild small country, but a big country with its own unique civilization.

Although the Khitans are nomadic people, they can abandon some low-level social forms on the grassland and develop their own civilization, and their national ideological system is very complete. They no longer rely on nomadic people to make a living, but learn other ways. Such a Khitan is enough to make people very scared.

In fact, it can't be said that Houjin is no match for Qidan. Although the post-Jin regime was unstable, it could still bring down the Khitan with its strong background, but it was expensive. If you don't fight back, you will die. If you bow down and fight back against the Turks like the Tang Dynasty, you can live in peace for a hundred years. Cao Wei defeated the barbarians because Wei was powerful. At that time, the barbarians were not as powerful as Qidan in the late Jin Dynasty.